EU acknowledgement added to homepage

[ainajene]

Description

• Added text to main page acknowledging ELIXIR CONVERGE project funding.
• Added EU flag logo

Motivation and Context

#73

How has this been tested?

Tested by previewing the markdown page.

What should reviewers focus on?

Does the text and logo appear OK on the main page.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New content (non-breaking change which adds new content)
• Modified content (non-breaking change which modifies existing content)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the CONTRIBUTING.md guide.
• My changes follow the code style of this project.
• I have updated supporting documentation, if required.
• I have added my details to the CONTRIBUTORS.yaml file.

[malloryfreeberg]

LGTM